The ESR spectrum of paratellurite (-TeO2) exposed to 1-MeV electron irradiation reveals a single spin-(1/2) defect in eight inequivalent sites with an anisotropic g value close to the free-electron value. Principal g values are 2.01050.0005, 1.9705 0.0005, and 1.9358 0.0005. Resolved hyperfine structure is attributed to magnetic isotopes of tellurium in seven different sites neighboring each defect site. The g-value anisotropy together with the hyperfine structure suggest a positively charged, oxygen-vacancy model (V0(bu) with properties intermediate between those of the E1 center in SiO2 and the F+ center in alkaline-earth oxides.
ASJC Scopus subject areas
- Condensed Matter Physics